Instrumentation Amplifiers

Instrumentation amplifiers (sometimes shortened to In-Amps) are a type of precision gain block used in electronic and measurement test equipment. Instrumentation amplifiers act as a differential amplifier; a type of electronic amplifier that amplifies the voltage difference between two inputs but suppresses any voltage signals that are common to the two inputs. RS Components offer a range of instrumentation amplifiers from several trusted brands in the industry, including Analog Devices, Microchip, Texas Instruments, and more.

How do instrumentation amplifiers work?

Instrumentation amplifiers are almost always composed of 3 op-amps (operational amplifiers) and several resistors. They provide the most important function of CMR (common-mode rejection) by cancelling out any signals that have the same potential as received by both of the inputs. Any signals that have different potentials get amplified. They are used for low frequency signals (such as <1MHz), which they amplify whilst also cutting out any common-mode noise that may be present in the input signal.

What are the instrumentation amplifiers used for?

An instrumentation amplifier measures small signals in a noisy environment. The noise generally is "common-mode noise" (the difference between the noise-free common-mode voltage and the actual common-mode voltage). An instrumentation amplifier uses its common-mode rejection to distinguish the noise from the signal of interest. Instrumentation amplifiers are needed in nearly every field of electronics, particularly in the test and measurement industry. They can be used as a voltage follower, selective inversion circuit, a current-to-voltage converter, active rectifier, integrator, a variety of filters, and a voltage comparator.

Unlike instrumentation amplifiers (In Amp), operational amplifiers (Op-Amp) are high-gain voltage amplifying devices with a differential input.

Typical applications

  • Test & Measurement Industrial Devices
  • Data Acquisition Devices
  • Medical Devices

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Description Price Power Supply Type Package Type Mounting Type Typical Single Supply Voltage Pin Count Typical Dual Supply Voltage Rail to Rail Maximum Input Offset Voltage Minimum Operating Temperature Maximum Operating Temperature Maximum Input Resistance Minimum CMRR Typical Gain Bandwidth Product Maximum Supply Current
RS Stock No. 923-6683
Mfr. Part No.INA333AIDGKT
kr 54,364
Each (On a Reel of 250)
Units
Dual, Single MSOP Surface Mount 1.8 5.5 V 8 ±0.9 ±2.75V Rail to Rail Output 0.025mV -40 °C +150 °C 100GΩ 80dB 150kHz 0.075 mA
RS Stock No. 704-4032
Mfr. Part No.INA333AIDGKT
kr 77,51
Each
Units
Dual, Single MSOP Surface Mount 1.8 5.5 V 8 ±0.9 ±2.75V Rail to Rail Output 0.025mV -40 °C +150 °C 100GΩ 80dB 150kHz 0.075 mA
RS Stock No. 811-5790
Mfr. Part No.LMP8358MA/NOPB
kr 88,60
Each
Units
Dual, Single SOIC Surface Mount 2.7 5.5 V 14 ±1.35 ±2.75V Rail to Rail Output 15µV -40 °C +125 °C - 105dB 930kHz 2.2 mA
RS Stock No. 100-0759
Mfr. Part No.INA128PA
kr 108,964
Each (In a Tube of 50)
Units
Dual PDIP Through Hole - 8 ±15V - 125µV -40 °C +85 °C 100GΩ 73dB 1.3MHz -
RS Stock No. 121-9394
Mfr. Part No.INA826AIDGK
kr 35,757
Each (In a Tube of 80)
Units
Dual, Single VSSOP Surface Mount 2.7 to 36 V 8 ±1.35 to ±18V Rail to Rail Output 150µV -40 °C +125 °C - 80dB 1MHz 200 μA
RS Stock No. 207-2388
Mfr. Part No.INA128PA
kr 126,11
Each
Units
Dual PDIP Through Hole - 8 ±15V No 125µV -40 °C +85 °C 100GΩ 73dB 1.3MHz -
RS Stock No. 709-6067
Mfr. Part No.AD627BNZ
kr 157,42
Each
Units
Dual, Single PDIP Through Hole 7.5 V 8 ±15V Rail to Rail Output 0.15mV -40 °C +85 °C 20GΩ 83dB - 0.085 mA
RS Stock No. 100-3802
Mfr. Part No.INA122UA
kr 75,491
Each (In a Tube of 75)
Units
Dual, Single SOIC Surface Mount 5 V 8 ±12 V, ±15 V, ±3 V, ±5 V, ±9 V Rail to Rail Output 0.5mV -40 °C +85 °C 10GΩ 76dB - 0.085 mA
RS Stock No. 285-8249
Mfr. Part No.INA122UA
kr 90,02
Each
Units
Dual, Single SOIC Surface Mount 5 V 8 ±12 V, ±15 V, ±3 V, ±5 V, ±9 V Rail to Rail Output 0.5mV -40 °C +85 °C 10GΩ 76dB - 0.085 mA
RS Stock No. 162-7734
Mfr. Part No.LMP8358MA/NOPB
kr 73,935
Each (In a Tube of 55)
Units
Dual, Single SOIC Surface Mount 2.7 5.5 V 14 ±1.35 ±2.75V Rail to Rail Output 15µV -40 °C +125 °C - 105dB 930kHz 2.2 mA
RS Stock No. 660-5248
Mfr. Part No.INA125U
kr 101,21
Each
Units
Dual, Single SOIC Surface Mount 5 V 16 ±15V No 0.25mV -55 °C +125 °C 100GΩ 78dB - -
RS Stock No. 813-6558
Mfr. Part No.INA826AID
kr 42,116
Each (In a Pack of 5)
Units
Dual, Single SOIC Surface Mount 2.7 36 V 8 ±1.35 ±18V Rail to Rail Output 150µV -40 °C +125 °C - 80dB 1MHz 200 μA
RS Stock No. 813-6567
Mfr. Part No.INA826AIDGK
kr 42,116
Each (In a Pack of 5)
Units
Dual, Single VSSOP Surface Mount 2.7 36 V 8 ±1.35 ±18V Rail to Rail Output 150µV -40 °C +125 °C - 80dB 1MHz 200 μA
RS Stock No. 921-2892
Mfr. Part No.INA826AID
kr 35,767
Each (In a Tube of 75)
Units
Dual, Single SOIC Surface Mount 2.7 36 V 8 ±1.35 ±18V Rail to Rail Output 150µV -40 °C +125 °C - 80dB 1MHz 200 μA
RS Stock No. 545-5405
Mfr. Part No.LTC1043CSW#PBF
kr 121,11
Each
Units
- SOIC W Surface Mount - 18 - - - -40 °C +85 °C - - - -
RS Stock No. 923-3537
Mfr. Part No.INA125U
kr 87,037
Each (In a Tube of 40)
Units
Dual, Single SOIC Surface Mount 5 V 16 ±15V - 0.25mV -55 °C +125 °C 100GΩ 78dB - -
RS Stock No. 145-9365
Mfr. Part No.MCP6N11-010E/SN
BrandMicrochip
kr 17,36
Each (In a Tube of 100)
Units
Single SOIC Surface Mount 1.8 5.5 V 8 - Rail to Rail Input/Output 0.35V -40 °C +125 °C - 81dB 5MHz 0.8 mA
RS Stock No. 661-2390
Mfr. Part No.INA126EA/250
kr 50,12
Each
Units
Dual MSOP Surface Mount 3 V, 5 V, 9 V, 12 V, 15 V, 18 V, 24 V, 28 V 8 ±15V No 0.5mV -40 °C +85 °C 1GΩ 74dB - 0.2 mA
RS Stock No. 197-7159
Mfr. Part No.INA128P
kr 172,20
Each
Units
Dual PDIP Through Hole ±15 V 8 - - 50µV - - - - - -
RS Stock No. 111-2200
Mfr. Part No.AD623ANZ
kr 85,932
Each (In a Tube of 50)
Units
Dual, Single PDIP Through Hole 3 V, 5 V, 9 V 8 ±3 V, ±5 V Rail to Rail Output 0.2mV -40 °C +85 °C 2GΩ 70dB - -